% Overloads Matlab/Octave's plot function for dseries objects.
%
% INPUTS:
% - o [dseries] object containing n time series to be plotted in the same figure.
% - varargin [cell] optionally a second dseries object, and some options to be passed to the plot command.
%
% OUTPUTS:
% - h [handle] plot handle.
%
% REMARKS:
% [1] If n > 1 , additional arguments cannot be passed to the plot function for customization. However, the plot can be modified afterward using the plot handle.
% [2] If two dseries objects are provided, it is assumed that both contain only one observation (i.e., n = 1 ). The function will then plot the second variable against the first.
